と言（い）ってもいい is a common expression in Japanese which literally means ‘even if you say (A), it is good/ok’. This is translated more naturally as ‘you could say (A)’, or ‘you might say (A)’.
As the
と at the beginning of the phrase is the ‘quotation’ use of the
と particle,
と言（い）ってもいい may be used after almost any statement that the speaker wants to quote.
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あの人（ひと）は一日（いちにち）に7食（しょく）も食（た）べているから、一日中（いちにちじゅう）食（た）べていると言（い）ってもいい。
That person eats 7 meals a day, so you could say that he is eating all day.
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そのスポーツは危（あぶ）ないと言（い）ってもいい。
You could say that sport is dangerous.
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あの人（ひと）の仕事（しごと）のやり方（かた）は丁寧（ていねい）だと言（い）ってもいい。
You could say that how that person works is careful.
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彼女（かのじょ）はすごい優（やさ）しい人（ひと）だと言（い）ってもいいでしょう。
It is safe to say that she is a very nice person.
Most grammatical structures in Japanese that use 言（い）う will often appear without kanji. This is simply to make them easier to recognize as a grammar pattern, rather than a standard word in a sentence. This is also true for patterns that include 行（い）く, or 来（く）る.